一、

條件狀語(yǔ)從條件狀從句通常由（如果）unless（非，aslong（只要）導(dǎo)。例如：Ifrainstomorrow,wewongotothepark.如明天下雨，我們就不去公園了。Unlessweatherstopsme,Igoforawalkevery.我天都會(huì)去散步，除非遇上壞天氣。Ourparentswillbepleasedwithourperformanceaslongastryourbest.小牛：1只要我們竭盡全力，父母就會(huì)滿意我們的表現(xiàn)。Ourparentswillbepleasedwithourperformance________________wetryourbest.2如果人人保護(hù)環(huán)境做出貢獻(xiàn)界將會(huì)變得更美好______________________________toprotectingtheenvironment,theworldwillmorebeautiful.二、if導(dǎo)的條件狀語(yǔ)從（）從+祈使句”的句子。其實(shí)，if作一連詞，主句也可以是其他形式的句子。例如：Ifyouwanttogo,pleaseletmeknow.Ifthegreenlight’ton,waitforaminute.(2)“祈使句+and(or)+陳句”在意思上相當(dāng)于一個(gè)帶有條件狀語(yǔ)從句的復(fù)合句。注意：“祈句and+陳句”可以轉(zhuǎn)化為if引導(dǎo)的肯定條件狀語(yǔ)從句，而且主語(yǔ)是第二人稱。B.“使句+or+陳述句”可以轉(zhuǎn)化為if引的否定條件語(yǔ)從句，而且主語(yǔ)是第二人稱。例如：Studyhardandyouwillpasstheexam.youhard,youwillpasstheexam.Hurryup,or’belate.=Ifyoudon’thurryup,youllbelate.考題

(2010重中)Workhard，youmaycatchwithyourclassmatessoon.A.orB.butC.andD.yet思解：句是祈使句and的型，句努力學(xué)習(xí)，你會(huì)很快趕上他同學(xué)”and在中表示承接關(guān)系，所以選C項(xiàng)答案C黑陷：題的陷阱是句型，本句型區(qū)別“祈使句＋or，這個(gè)句型的含義“…，不然的話/則……”。綠通：使句后面既可以加and，可以加or，所以要全面分析句意，再作決定小牛：if連下句子1、Gotobedearlyandwillhaveagoodrest.2、Hurryup,oryoullmissthebus.三、if句與主句具有以特點(diǎn)：1．If從句用般在，示來(lái)一種件從中以時(shí)狀。e.g.Ifcan’tcometomorrow,wecanthepartyalittlelater.天你如果不能來(lái)，我們可遲一點(diǎn)舉行宴會(huì)。精選

Ifitdoesnraintomorrow,we’llgototheWall.明天如果不下雨，我們就去長(zhǎng)城。2．表示未的件，句用般來(lái)，句一現(xiàn)時(shí)即“將現(xiàn)表如某條件在就可不能生么情e.g.Ifdon’tgetupearly,youwillbelate你果不早點(diǎn)起床，上學(xué)就會(huì)遲到。IfIplayonit,itwillgowrong.

如果我用它玩游戲，它就會(huì)壞掉。3．if從句放主前主后從置于句時(shí)須逗與句開反則用號(hào)。e.g.Ifit’sfinetomorrow,cango

如果明天天氣好，我們就能出去。Shewillhappyifshejoinstheparty.如她加聚會(huì)她會(huì)很開心的。I’llasktheteacherforhelpifdonunderstand.如我不懂我會(huì)求助師的。三．注if引導(dǎo)的條狀語(yǔ)從和賓語(yǔ)從句區(qū)別if可用來(lái)引導(dǎo)賓語(yǔ)從句也可以用來(lái)引導(dǎo)條件狀語(yǔ)從句，主要是要弄清i導(dǎo)從句的時(shí)態(tài)if在導(dǎo)語(yǔ)從句時(shí)，意為“是否根實(shí)際情況來(lái)確定時(shí)態(tài)，而if在導(dǎo)條件狀語(yǔ)從句時(shí)意為“如果，假設(shè)一般時(shí)代替將來(lái)時(shí)，即“主將從現(xiàn)e.g.Iwanttoknowifhewilltomorrow.想知道他明天是否到這兒來(lái)。（if在句引導(dǎo)的是賓語(yǔ)從句，從句中有很明顯的表將來(lái)的時(shí)間狀語(yǔ)tomorrow，所以if從要用一般將來(lái)時(shí)e.g.Ifitrainstomorrow,’putoffthesportsmeeting.如果天下雨，我們就推遲運(yùn)動(dòng)會(huì)。（if在句引導(dǎo)的是條件狀語(yǔ)從句，盡管從句中也有表將來(lái)時(shí)的時(shí)間狀語(yǔ)tomorrow，從理論上講也應(yīng)該用一般將來(lái)時(shí)在if導(dǎo)的條件狀語(yǔ)從句中要用一般現(xiàn)在時(shí)替一般將來(lái)時(shí)謂語(yǔ)用rains而不用will）二典分12010海Wehavenowatertodrinkdontprotecttheearth.A.untilB.beforeC.thoughD.if[答案]D．[解析if引條件狀語(yǔ)從句，示“果思是如果我們不保護(hù)地球，我們將會(huì)沒有水喝。22011重慶）Wewillplanttreestomorrow,andI’tknowTomwillcomeandjoinus.A.ifB.whichC.whatD.where[答案]A．解析if引賓語(yǔ)從，表示是否思是我們明天將會(huì)去植樹，但是我不知Tom會(huì)會(huì)去。3、knowiffinishedthework?—yet.Ifhe,hewillgivemeaA.hes,willfinishB.he’ll,finishesC.hes,finishesD.he’llwillfinish[答案]C．解析]問(wèn)句的if引賓語(yǔ)從句，表示“是句要用陳述語(yǔ)序，從答句Notyet.中可以看出從句應(yīng)該用現(xiàn)在完成時(shí)態(tài)，答句的if引導(dǎo)狀語(yǔ)從句，要遵循主將從現(xiàn)的規(guī)律。練習(xí)一用if連下的句：1、Youdounderstandarticle.Askyourteacher.精選

2、Youwanttoknowmoreaboutit.Pleasecallyourteacher.3、Tellhimtomakeaphonecallme.willcomeheretomorrow.4、Youwanttogo.Pleasetellme.5、atourwebsite.Thecameradoeswork.二用給提詞成個(gè)if導(dǎo)條狀從。1、tired,havearest(Tom)2、notgobedearly,feelsleepy(you)3、becomeunhealthy,noteatvegetables(children)4、notlistentoteacher,studywell(I)5、fallbehindothersinstudying,spendtoomuchtimeonthegames(DaWei)三單選：1.Youaresuretopassthe___youstudyhard.A.ifB.thoughC.thatD.since2.I'llgotoseethefilmwithyou___Ihavethisevening.A.whetherB.soC.ifD.when3.___youstudyharder,you'llneverpassthefinalexam.A.IfB.UntilC.UnlessD.Except4．’stayathomeit______thisafternoon.ArainB．CtorainD．raining5．willgotoGreatWallifit______tomorrow.A’trainBisn’rainingC．Ddoesn’rain6．Idontknowifhe______.—Hewillcomeifit______.Acomes;wontrainBwillcome;’rainC．comes;doesn'trainD．willcome;won’rain精選

7．Doyouknowwhattime______？AtheleavedoesthetrainleaveC．willthetrainleaveDthetrainleaves8．Doyouthinkif______anEnglishfilmnight？AisthereB．thereisgoingtohaveC．thereisgoingtobeD．willtherebe9．youpleasetellme______AwherePudongAirportB．howfarAirportwasC．howcanwegettoPudongAirportD．whenwasPudongAirportbuilt10．Mikewantstoknowif______apicnictomorrow.—Yes.Butifit______,we’llvisitthemuseuminstead.Ayouhave;willrainB．youwillhave;willrainC．willhave;rainsDwillyouhave;rains11．Whydidn’tNickcometoschoolyesterday？—______hewasill.AAfterB．WhereC．WhenDBecause12．Thisboxis______heavy______cantcarryit.Atoo;B．so;thatC．very;thatD．that13．Idon’tknow______hestillliveshere.AwhereB．C．whenD．whether14.---Doyouknowifhe_______toplaybasketballwithus?---Ithinkhewillcomeif______freetomorrow.A.comes;isB.comes;willbeC.willcome;isD.willcome;willbe15.Inthezooifachildintothewaterandcan’tswim,thedolphinsup______him.A.willfall;tohelpB.falls;tohelpC.willhelpD.falls;helping16.Inthebookshop，readeraskedtheshopkeeper___WhoMovedwasinterestingbook.A.thatB.howC.whatD.if17、Iwanttoknow________youhavebrother.A.ifB.thatC.thoseD.them18Wegohikingifittomorrow.A.willbefineB.isfineC.befineD.istobefine19、Maybeyou